Automatic magnetic lock



E. M. WATSON.

AUTOMATIC MAGNETIC LOCK.

APPLICATION men JUNE 20,1919.

1,405,369. Patented Jan. 31,1922.

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- Inventor Eda/UL M Mal/tam came stares rarenrfort'icag EDWIN M. WATSON, or nos Ton, MASSACHUSETTS.

AUTOMATIC MAGNETIC LOCK.

I Specification of Letters Patent. Patented J n 31 192% Application filed June 20, 1919. Serial No. 305,689.

To all whom it may concern:

Be it known that I, EDWIN M. WArsoN,

a citizen of the United States, residin at Boston, in the county of Suffolk and tate of Massachusetts, have invented new and useful Improvements in Automatic, Magnetic Locks, of which the following is a specification. V

This invention relates to automatic magnetic locksand is particularly desi ned'to be used in connection'with doors and atches leading to the boiler rooms of steam vessels particularly of the torpedo boat destroyer type which use oil for fuel, and because of the use of said fueloil and the necessity of providing at times a forced draft areobliged to keep the boilerrooms under air pressure.

Underlthese circumstances it is always necessary to provide a double set of doors.

together with a small passage-way known 'as an air lock located therebetween for leading to the boiler room may be carelessly opened at the same time, in wh chevent the air within the boiler room will rush outwardly through said doors thereby causing a flare-back. This flare-back results from a draft coming down the smoke stack instead of passing up the same, thereby drawing the flame from under the boilers out into the boiler room and thereby burn-- ing the occupants of said boiler room befor the flames can be controlled. 7

The object of the invention is to provide an automatic safety locking device for the doors above referred to, independent of other hand operated fastening devices, and thereby make it impossible when one of the doors has been opened to open the other door.

The invention consists in the combination and arrangement of parts set forth in the following specification and lock pointedout in the claims thereof.

Referring to the drawings: F gure 1 is a diagrammatic representation of my improvedmechanism, the same being illustrated in connection with'twocon ventional doors.

particularly Figs. 2 and 8 are detail views of a switch used in connection with'my improved device. I

Like numerals refer to like out the several views of the drawings.

In the drawings, Aand B are two-conventional doors. These doors may represent the doors of a passage-way or air leading to the boiler room of a vessel which is obliged. to have the boiler room under air pressure in' order to' provide a forced draft for the boilers.

Each of the doorsA and Bare provided with duplicate parts and duplicate electriparts throughcal equipment, therefore the description of i one of said doors applies equally well to the other. I

1 Fa'stto the door A is a finger 5, saidfinger- -5'constituting a means for'simultaneously making or breaking an-electric, circuit I in two places at a switch C thereby energiz-f ing or de-energizing a double coil electromagnetD which controls a bolt mechanism E provided for the door B." Q j The switch C illustrated in detail in Figs. 2 and 3 is fastened to awall 'G 'adjacent to the door A in-sucha'manner-that when the door A is closed the finger 5'will engage a plunger 7 constructed of non-conductive material which is fast'enedto a'pair of contact members Sand thereby force said contact members out of engagement with asec- 0nd pair of conductors 9 mounted upon a casing 10. Terminals 11 Connect with the contact members-8. 7

Each contact member 8 is pivotedupon a bracket -12'-which is fastened to a base plate 13 constructed of insulating material. 'Al spring 14' normally tends'i'to force the'mm bers 8 into contact with the members 9. An electric conductor 15 connects each bracket 12 with terminals 16 fast to the base plate 13. Wires 17 and 18 connect the terminals 15 with terminals 19 provided for the electro-magnet D which operates the bolt mechanism Eof the door B.

An armature 20 is pivoted at 21 to a plate 22 which forms a base for the electro-magnet D in such a manner that when the electromagnet D is energized, said armature will operate a bolt 23 connected thereto, said bolt constituting a part-of the bolt mecha-- nism E of the door B.

The bolt 23'is mounted in a slide 2% and is adapted to engage a socket 25 fast to the door B at'which time said door will be locked.

When the electro-magnet D is de-energized a spring 26 will automatically pull the armature 20 against a stoppin 27 at which time the bolt 23 will be disengaged from the socket 25 and'the door B will be unlocked.

The terminals 11 connect through wires 28 and 29 with a suitable source of electric supply. Switches 30 and 3]. are provided whereby said source of electric supply may be. cut 0E when desired as for example when the boiler room' is not under pressure and it is not desired to use the safety device.

The operation of my improved automatic magnetic lock is as follows If a person wishes to enter or leave the boiler room,he approaches either of the doors A or B which in their normally closed position are bothifastened by hand operated fastening devices, but are both unlocked as far as my automatic magnetic lock is concerned. In attempting to open the door whichis at first approached, if the door is found locked it indicates that the door beyond is open. If, however, on attempting to open door the door opens, the" opening of said door will close the electric circuit: at the switch C adjacent to the door opened, which will energize the electromagnet D and thereby operate the bolt mech anism E of the door which is beyond, thereby locking said door. The door beyond cannot now be opened by anyone until the first door has been closed. hen the first door has again been closed, the electric circuit will again be broken at the switch C of said door thereby de-energizing the elec tro-magnet D of the door beyond and thereby automatically unlocking said door, which is then free to be opened. Simultaneously with the opening of the second door the switch C will close; the electric circuit to the electro-magnet D of the door first opened and thereby automatically operate the bolt mechanism E to lock said door which in turn cannot then be opened until the second door is again closed, at which" time both doors will become automatically unlocked. In attempting to enter or leave the boiler room the operation of each door is exactly the same. 7 7

It should be understood that the term boiler room, as hereinbefore used, designates both the boiler room and the fireroom which generally are substantially one room being only separated by a grating. If, however, said rooms should happen to be separated by a solid flooring, the" mechanism hereinbeforedescribed would be used in con nection with the fireroom.

Having thus specifically described my invention what I claim and desire by Letters Patent to secure is:

1. A device of the character described having, in combination, a pair of doors, a sliding belt for each door, an armature for each bolt pivotally mounted intermediate its length and attached at one end thereof to its bolt, an electro-magnet adapted to operate each bolt respectively through its armature, a source of electriesupply, and means operated by each door whereby when one of said doors is opened the electric circuit to the electromagnet of the closed door willbe completed and said electro-magnet will be energized thereby operating its bolt directly through its armature whereby said" door will be automatically-locked. v

2. A device of the character described having, in combination, a pair of doors, a sliding bolt for each door, an armature for each bolt pivotally mounted intermediate its length and attached at one end thereof to its bolt, an electro-magnet adapted to operate each bolt respectively through its armature, a source of electric supply, means operated by each door whereby when one of said doors is opened the electric circuit to the electromagnet of'the closed door will be completed and said electroanagnet will be energized thereby operatingits bolt directly through its armature whereby said door will be automatically locked, and a spring connected to the opposite end of said armature from said bolt whereby when said opened. door is again closed and the electric circuit is again broken thereby derenergizing the electromagnet of the closed door, said closed door will be automatically unlocked.

In testimony whereof I have hereunto setmy hand in presence of two subscribing witnesses.

EDWIN li LIVATSON. l Vitnesses HERMAN It. HOFFMAN, FRANKLIN E. Low. 

